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‎reference/mdspan/is-mapping-of.html

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<div class="identifier-type">variable</div><div class="header">&lt;mdspan&gt;</div><h1 itemprop="name"><span class="token">is-mapping-of</span><span class="cpp cpp23" title="C++23で追加">(C++23)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">Layout</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Mapping</span><span class="o">&gt;</span>
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<span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">is</span><span class="o">-</span><span class="n">mapping</span><span class="o">-</span><span class="n">of</span> <span class="o">=</span> <span class="c1">// exposition only</span>
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<span class="n"><a href="../type_traits/is_same.html">is_same_v</a></span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">Layout</span><span class="o">::</span><span class="k">template</span> <span class="n">mapping</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">Mapping</span><span class="o">::</span><span class="n">extents_type</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">Mapping</span><span class="o">&gt;</span><span class="p">;</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>is-mapping-of</code>は、<code>Mapping</code>が<code>Layout</code>の<a href="LayoutMapping.html">レイアウトマッピング</a>か否かを判定する説明専用変数テンプレートである。</p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++23</li>
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</ul>
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<h2>関連項目</h2>
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<ul>
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<li><a href="LayoutMappingPolicy.html">LayoutMappingPolicy</a></li>
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<li><a href="LayoutMapping.html">LayoutMapping</a></li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html" target="_blank">P0009R18 MDSPAN</a></li>
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‎reference/mdspan/layout_left/mapping/op_constructor.html

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mdspan&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;layout_left::mapping&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;2f83282fb8ef3f977cd79a354390ac9afacbc753&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;array&gt;\n#include &lt;mdspan&gt;\n\nusing Ext3x4 = std::extents&lt;size_t, 3, 4&gt;;\nusing Ext3xN = std::extents&lt;size_t, 3, std::dynamic_extent&gt;;\n\nint main()\n{\n // (1) : \u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3x4&gt; map1_3x4;\n std::layout_left::mapping&lt;Ext3xN&gt; map1_3xN;\n assert(map1_3x4.required_span_size() == 12);\n assert(map1_3xN.required_span_size() == 0);\n }\n // (2) : \u30b3\u30d4\u30fc\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3xN&gt; map2_a;\n std::layout_left::mapping&lt;Ext3xN&gt; map2_b = map2_a;\n assert(map2_a == map2_b);\n }\n // (3) : extents\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n Ext3xN ext{4};\n std::layout_left::mapping&lt;Ext3xN&gt; map3 = ext;\n assert(map3.extents() == ext);\n }\n // (4) : layout_left::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3x4&gt; map4_3x4;\n std::layout_left::mapping&lt;Ext3xN&gt; map4_3xN = map4_3x4;\n assert(map4_3x4 == map4_3xN);\n }\n // (5) : layout_right::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n using Ext1D = std::dextents&lt;size_t, 1&gt;;\n std::layout_right::mapping&lt;Ext1D&gt; src5{Ext1D{5}};\n std::layout_left::mapping&lt;Ext1D&gt; dst5 = src5;\n }\n // (6) : layout_stride::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::array strides{1, 3};\n std::layout_stride::mapping&lt;Ext3x4&gt; src6{{}, strides};\n std::layout_left::mapping&lt;Ext3x4&gt; dst6{src6}; // (explicit)\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mdspan&#34;, &#34;layout_left&#34;, &#34;mapping&#34;, &#34;op_constructor&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mdspan&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;layout_left::mapping&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;d2b0bbef45cc0ea10d29cd3a25e9a6a27208f2c9&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;array&gt;\n#include &lt;mdspan&gt;\n\nusing Ext3x4 = std::extents&lt;size_t, 3, 4&gt;;\nusing Ext3xN = std::extents&lt;size_t, 3, std::dynamic_extent&gt;;\n\nint main()\n{\n // (1) : \u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3x4&gt; map1_3x4;\n std::layout_left::mapping&lt;Ext3xN&gt; map1_3xN;\n assert(map1_3x4.required_span_size() == 12);\n assert(map1_3xN.required_span_size() == 0);\n }\n // (2) : \u30b3\u30d4\u30fc\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3xN&gt; map2_a;\n std::layout_left::mapping&lt;Ext3xN&gt; map2_b = map2_a;\n assert(map2_a == map2_b);\n }\n // (3) : extents\u304b\u3089\u69cb\u7bc9\n {\n Ext3xN ext{4};\n std::layout_left::mapping&lt;Ext3xN&gt; map3 = ext;\n assert(map3.extents() == ext);\n }\n // (4) : layout_left::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::layout_left::mapping&lt;Ext3x4&gt; map4_3x4;\n std::layout_left::mapping&lt;Ext3xN&gt; map4_3xN = map4_3x4;\n assert(map4_3x4 == map4_3xN);\n }\n // (5) : layout_right::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n using Ext1D = std::dextents&lt;size_t, 1&gt;;\n std::layout_right::mapping&lt;Ext1D&gt; src5{Ext1D{5}};\n std::layout_left::mapping&lt;Ext1D&gt; dst5 = src5;\n }\n // (6) : layout_stride::mapping\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n {\n std::array strides{1, 3};\n std::layout_stride::mapping&lt;Ext3x4&gt; src6{{}, strides};\n std::layout_left::mapping&lt;Ext3x4&gt; dst6{src6}; // (explicit)\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mdspan&#34;, &#34;layout_left&#34;, &#34;mapping&#34;, &#34;op_constructor&#34;]}">
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-07-29T06:21:10">
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2024年07月29日 06時21分10秒
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<span itemprop="datePublished" content="2024-08-26T11:40:12">
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2024年08月26日 11時40分12秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<ul>
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<li>(1) : デフォルトコンストラクタ</li>
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<li>(2) : コピーコンストラクタ</li>
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<li>(3) : <code><a href="../../extents.html">extents</a></code>からの変換コンストラクタ</li>
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<li>(3) : <code><a href="../../extents.html">extents</a></code>から構築</li>
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<li>(4) : 他<code>layout_left::mapping</code>からの変換コンストラクタ</li>
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<li>(5) : <code><a href="../../layout_right/mapping.html">layout_right::mapping</a></code>からの変換コンストラクタ</li>
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<li>(6) : <code><a href="../../layout_stride/mapping.html">layout_stride::mapping</a></code>からの変換コンストラクタ</li>
@@ -289,7 +289,7 @@ <h2><a class="cpprefjp-defined-word" data-desc="満たさなければプログ
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<ul>
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<li>(7) : 以下を満たすとき、<code>extents_type::<a href="../../extents/static_extent.html">static_extent</a>(0)</code>が<code><a href="../../layout_left_padded/mapping.html">LayoutLeftPaddedMapping::static-padding-stride</a></code>に等しいこと。<ul>
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<li><code>extents_type::<a href="../../extents/rank.html">rank()</a> &gt; 1</code>、かつ</li>
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<li><code>extents_type::<a href="../../extents/static_extent.html">static_extent</a>(0)</code>が<code><a href="../../../span/dynamic_extent.html">dynamic_extent</a></code>と等しくなく、かつ</li>
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<li><code>extents_type::<a href="../../extents/static_extent.html">static_extent</a>(0) != <a href="../../../span/dynamic_extent.html">dynamic_extent</a></code>、かつ</li>
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<li><code>LayoutLeftPaddedMapping::static-padding-stride</code>が<code><a href="../../../span/dynamic_extent.html">dynamic_extent</a></code>と等しくないとき。</li>
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</ul>
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</li>
@@ -324,7 +324,7 @@ <h2>explicitになる条件</h2>
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<li>(7) : <code>!<a href="../../../type_traits/is_convertible.html">is_convertible_v</a>&lt;typename LayoutLeftPaddedMapping::extents_type, extents_type&gt;</code></li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="2f83282fb8ef3f977cd79a354390ac9afacbc753"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../../cassert.html">&lt;cassert&gt;</a></span><span class="cp"></span>
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<p><div class="yata" id="d2b0bbef45cc0ea10d29cd3a25e9a6a27208f2c9"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../../cassert.html">&lt;cassert&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../../../array.html">&lt;array&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../../../mdspan.html">&lt;mdspan&gt;</a></span><span class="cp"></span>
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@@ -346,7 +346,7 @@ <h2>例</h2>
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<span class="n"><span style="color:#ff0000">std::layout_left::mapping</span></span><span class="o">&lt;</span><span class="n">Ext3xN</span><span class="o">&gt;</span> <span class="n">map2_b</span> <span class="o">=</span> <span class="n">map2_a</span><span class="p">;</span>
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<span class="n"><a href="../../../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n">map2_a</span> <span class="o">==</span> <span class="n">map2_b</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="c1">// (3) : extentsからの変換コンストラクタ</span>
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<span class="c1">// (3) : extentsから構築</span>
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<span class="p">{</span>
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<span class="n">Ext3xN</span> <span class="n">ext</span><span class="p">{</span><span class="mi">4</span><span class="p">};</span>
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<span class="n"><span style="color:#ff0000">std::layout_left::mapping</span></span><span class="o">&lt;</span><span class="n">Ext3xN</span><span class="o">&gt;</span> <span class="n">map3</span> <span class="o">=</span> <span class="n">ext</span><span class="p">;</span>

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